Application of Hard Carbon Anode Material in New Energy Vehicle

Application of Hard Carbon Anode Material in New Energy Vehicle

The negative pole refers to the lower end of the power supply. In galvanic cells, the oxidizing electrode is shown on the left. In physical terms, the pole from which electrons flow out of a circuit. And the anode material, refers to the raw material of the cathode in the battery, the common anode materials are carbon anode material, tin base anode material, lithium transition metal nitride anode material, alloy anode material and nano level anode material.

Anode material is one of the key factors to determine the performance of lithium ion battery. Currently, the cathode materials used in commercial lithium ion battery mainly include:

1. Graphite carbon materials, divided into natural graphite, artificial graphite;

2, disordered carbon materials, including hard carbon and soft carbon;

3, lithium titanate material;

4, silicon based materials, mainly divided into carbon coated silicon oxide composite material, nano silicon carbon composite material, amorphous silicon alloy.

This paper mainly describes the application of Hard Carbon anode materials for lithium batteries in the field of new energy vehicles. Hard Carbon refers to graphitized Carbon, generally 500 ~ 700mAh. The hard carbon structure is stable and the charge-discharge cycle life is long, and the carbon-lithium potential can be higher than 0. 2V, better safety performance. Crystal dispersion of hard carbon makes it easy for lithium ions to come in and out, which is convenient for increasing the output power of the battery, but the disadvantage is that the amount of lithium ions stored is less, so the capacity will be smaller.

A simple estimate is that a Japanese Leaf EV needs a lithium battery (24kWh) equivalent to the lithium battery of more than 4400 apple iPhone5 phones (3. 8V / 1434mAh, about 5. 45Wh), even if one is equipped with 2. The 4kWh lithium-ion battery hybrid (HEV) also requires 440 iPhone5 lithium-ion batteries. As a result, the market for lithium-ion batteries for electric vehicles and hybrid vehicles is very attractive to leading anode material companies. Considering the characteristics of hard carbon material, it is relatively more suitable for the manufacturing of power lithium battery for hybrid vehicle (HEV).

Lithium battery made of hard carbon anode material has many advantages, such as high voltage, high energy, long cycle life, no memory effect and so on. It has been widely used in consumer electronics, power tools, medical electronics and other fields. In the pure electric vehicle, hybrid electric vehicle, electric bicycle, rail transit, aerospace, ships and vessels and other transportation fields gradually promoted. At the same time, lithium ion battery also shows a good application prospect in large-scale renewable energy access, peak frequency modulation of power grid, distributed energy storage, home energy storage, data center backup power supply, communication base station, industrial energy conservation, green buildings and other energy fields.